Background. Restoration of the mechanical axis is amain objective in total knee replacement (TKR). Aim of this study was to analyse\nthe verification tool of a pinless navigation system in conventional TKR (cTKR). Methods. In a prospective study, 147 TKR were\nperformed by conventional technique. Using the ââ?¬Å?pinless verificationââ?¬Â mode of a smartphone based navigation system, the cutting\nblock position and final resection plane for distal femur and proximal tibial resectionweremeasured. If necessary, the block position\nor resection level were optimized, corrections were protocolled. Postoperatively, standardized radiographs were performed. Results.\nIn 65.3%, intraoperative measurements changed the surgical procedure (corrections: 20.4% femoral, 25.9% tibial, 19% both). The\nadditional time for surgery compared to cTKR averaged 6 minutes (79 Ã?± 15 versus 73 Ã?± 17 minutes). Using navigation data, the\nfinal femoral and tibial axes were in 93% within a range of Ã?±2âË?Ë?. A mean difference of 1.4âË?Ë? and 1.6âË?Ë? could be shown between the final\nmeasurement of the navigation system and the postoperative mLDFA and mMPTA. Conclusion. Intraoperative pinless navigation\nhas impact on the surgical procedure in the majority of cTKR. It represents a less time-consuming tool to improve implant position\nwhile maintaining the routine of conventional technique.
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